What would have happened if US soldiers had died in this landmine explosion?

I heard that the area where the landmine exploded is under the jurisdiction of the United Nations Command, so the UN forces were scheduled to conduct an on-site investigation. What would have happened if US forces in Korea had been killed or injured during that investigation?
Would Trump have immediately sent aircraft carriers and fighter jets to North Korea?

Jang Do-young, spokesperson for the Joint Chiefs of Staff, stated during a regular briefing on the 22nd, “Yesterday's (21st) operation in the Demilitarized Zone was a route-clearing operation to prepare conditions prior to the United Nations Command's on-site investigation.”